GB1532810A - Apparatus for monitoring evaporation loss - Google Patents
Apparatus for monitoring evaporation lossInfo
- Publication number
- GB1532810A GB1532810A GB5178775A GB5178775A GB1532810A GB 1532810 A GB1532810 A GB 1532810A GB 5178775 A GB5178775 A GB 5178775A GB 5178775 A GB5178775 A GB 5178775A GB 1532810 A GB1532810 A GB 1532810A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- level
- transistor
- resistor
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000008020 evaporation Effects 0.000 title abstract 2
- 238000001704 evaporation Methods 0.000 title abstract 2
- 238000012544 monitoring process Methods 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 3
- 239000007788 liquid Substances 0.000 abstract 2
- 239000012141 concentrate Substances 0.000 abstract 1
- 239000012153 distilled water Substances 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
- G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
1532810 Automatic level control J W WALKER AND J P MAGILL 18 Dec 1975 51787/75 Heading G1A An apparatus for maintaining evaporation loss has an evaporimeter containing a liquid, first and second sensors positioned at different levels and connected to an electric circuit having means for controlling a refilling means and for indicating levels of the liquid. In the evaporimeter shown the first and second, i.e. zero set level, photo-resistors are mounted aligned with lensed end-point source lamps on a member displaceable in a vertical slot. The evaporimeter is initially filled to the zero line with distilled water which concentrates light on each photo-resistor. As water evaporates, from the cup which is filled with glass balls on a level with the zero line and connected by a flexible U-tube to the transparent scaled part of the vessel, the level falls so that one and then both photo-resistors receive less light. Potentiometer VR 1 , is set so that the voltage on the inverting input of amplifier A, is lower than its non-inverting input so that its output goes positive, so that transistor T4 conducts giving a collector potential of TTL'O'. The potentiometer VR 2 is set so that the voltage on the inverting input of amplifier A 2 is the higher, so that the output of transistor T 5 will be 'I'. For the RS bistable in the initial condition the outputs of gates G 1 and G 2 are 1 and 0 respectively, so that the zero indication lamp lights. As the level drops below the first photo-resistor transistor T 4 output rises to 1 and when it drops below the second photo-resistor, transistor T 5 output drops to 0, whereupon the RS bistable changes so that the outputs of gates G 1 and G 2 are 0 and 1, so that the refill lamp lights and relay RLA is energized causing the refill valve to be opened, the exhaust valve to shut, a water supply for a greenhouse to be turned on and causing audible warning. The RS bistable changes back when the level reaches the first photo-resistor again. Reference has been directed by the Comptroller to Specification 1438271.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5178775A GB1532810A (en) | 1975-12-18 | 1975-12-18 | Apparatus for monitoring evaporation loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5178775A GB1532810A (en) | 1975-12-18 | 1975-12-18 | Apparatus for monitoring evaporation loss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1532810A true GB1532810A (en) | 1978-11-22 |
Family
ID=10461384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5178775A Expired GB1532810A (en) | 1975-12-18 | 1975-12-18 | Apparatus for monitoring evaporation loss |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1532810A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2463403A1 (en) * | 1979-08-09 | 1981-02-20 | Truetzschler & Co | MANOMETRIC ELECTRIC SWITCH |
-
1975
- 1975-12-18 GB GB5178775A patent/GB1532810A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2463403A1 (en) * | 1979-08-09 | 1981-02-20 | Truetzschler & Co | MANOMETRIC ELECTRIC SWITCH |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |